/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.runtime.state;

import org.apache.flink.annotation.PublicEvolving;

import java.io.IOException;
import java.io.InputStream;

/**
 * This class provides access to an input stream that contains state data for one key group and the key group id.
 */
@PublicEvolving
public class KeyGroupStatePartitionStreamProvider extends StatePartitionStreamProvider {

	/** Key group that corresponds to the data in the provided stream */
	private final int keyGroupId;

	public KeyGroupStatePartitionStreamProvider(IOException creationException, int keyGroupId) {
		super(creationException);
		this.keyGroupId = keyGroupId;
	}

	public KeyGroupStatePartitionStreamProvider(InputStream stream, int keyGroupId) {
		super(stream);
		this.keyGroupId = keyGroupId;
	}

	/**
	 * Returns the key group that corresponds to the data in the provided stream.
	 */
	public int getKeyGroupId() {
		return keyGroupId;
	}
}